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Stepanov's biggest blunder? The curious case of adjacent difference

news.ycombinator.com Roman Kashitsyn 2025-11-01 23:30:59

The curious case of adjacent difference If you have ever tried using the std::adjacent_difference algorithm in c++, I’m sure it left you puzzled. As the name suggests, this algorithm computes differences between adjacent elements of the input sequence, but it does one more thing: it copies the first element of the input sequence into the output sequence unmodified. The following example demonstrates how to apply the algorithm to delta-compress a postings list of document identifiers that contain

Topics: adjacent_difference partial sequence std sums
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Show HN: I built a toy TPU that can do inference and training on the XOR problem

news.ycombinator.com Unknown 2025-11-16 17:52:14

Nobody really understands how TPUs work…and neither do we! So we wanted to make this because we wanted to take a shot and try to guess how it works–from the perspective of complete novices! We wanted to do something very challenging to prove to ourselves that we can do anything we put our mind to. The reasoning for why we chose to build a TPU specifically is fairly simple: None of us have real professional experience in hardware design, which, in a way, made the TPU even more appealing since w

Topics: bmatrix frac mathbf partial phantom
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Parametric shape optimization with differentiable FEM simulation

news.ycombinator.com Unknown 2026-02-04 21:11:57

All examples are expected to run from the examples/<example_name> directory of the Tesseract-JAX repository . In this example, you will learn how to: Compose both Tesseracts with Tesseract-JAX to create a pipeline that can be used for differentiable shape optimization. Build a Tesseract that uses finite differences under the hood to enable differentiability of a non-autodifferentiable geometry operation (computing a signed distance field from a 3D model). In this notebook, we explore the opt

Topics: design field jacobian partial theta
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Solving LinkedIn Queens Using Haskell

news.ycombinator.com Agnishom Chattopadhyay 2026-03-04 15:29:08

June 24, 2025 · Agnishom Chattopadhyay [Thanks to James Haydon for his suggestions on improving the post and the code quality] On LinkedIn, you can play a variant of the N-Queens problem. A community version of the game (rather, puzzle) can be found here. Recently, we saw it solved using SAT solvers, using SMT Solvers, using APL and MiniZinc. Today, I will try solving it using Haskell, a slightly more conventional language. The Puzzle You are given a N-colored square-shaped board of size N.

Topics: column partial problem row set
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